#!/usr/bin/env python
# Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
#
# Use of this source code is governed by a BSD-style license
# that can be found in the LICENSE file in the root of the source
# tree. An additional intellectual property rights grant can be found
# in the file PATENTS.  All contributing project authors may
# be found in the AUTHORS file in the root of the source tree.

import datetime
import httplib2
import json
import subprocess
import time
import zlib

from tracing.value import histogram
from tracing.value import histogram_set
from tracing.value.diagnostics import generic_set
from tracing.value.diagnostics import reserved_infos


def _GenerateOauthToken():
    args = ['luci-auth', 'token']
    p = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    if p.wait() == 0:
        output = p.stdout.read()
        return output.strip()
    else:
        raise RuntimeError(
            'Error generating authentication token.\nStdout: %s\nStderr:%s' %
            (p.stdout.read(), p.stderr.read()))


def _CreateHeaders(oauth_token):
    return {'Authorization': 'Bearer %s' % oauth_token}


def _SendHistogramSet(url, histograms):
    """Make a HTTP POST with the given JSON to the Performance Dashboard.

    Args:
      url: URL of Performance Dashboard instance, e.g.
          "https://chromeperf.appspot.com".
      histograms: a histogram set object that contains the data to be sent.
    """
    headers = _CreateHeaders(_GenerateOauthToken())

    serialized = json.dumps(_ApplyHacks(histograms.AsDicts()), indent=4)

    if url.startswith('http://localhost'):
        # The catapult server turns off compression in developer mode.
        data = serialized
    else:
        data = zlib.compress(serialized)

    print 'Sending %d bytes to %s.' % (len(data), url + '/add_histograms')

    http = httplib2.Http()
    response, content = http.request(url + '/add_histograms',
                                     method='POST',
                                     body=data,
                                     headers=headers)
    return response, content


def _WaitForUploadConfirmation(url, upload_token, wait_timeout,
                               wait_polling_period):
    """Make a HTTP GET requests to the Performance Dashboard untill upload
    status is known or the time is out.

    Args:
      url: URL of Performance Dashboard instance, e.g.
          "https://chromeperf.appspot.com".
      upload_token: String that identifies Performance Dashboard and can be used
        for the status check.
      wait_timeout: (datetime.timedelta) Maximum time to wait for the
        confirmation.
      wait_polling_period: (datetime.timedelta) Performance Dashboard will be
        polled every wait_polling_period amount of time.
    """
    assert wait_polling_period <= wait_timeout

    headers = _CreateHeaders(_GenerateOauthToken())
    http = httplib2.Http()

    oauth_refreshed = False
    response = None
    resp_json = None
    current_time = datetime.datetime.now()
    end_time = current_time + wait_timeout
    next_poll_time = current_time + wait_polling_period
    while datetime.datetime.now() < end_time:
        current_time = datetime.datetime.now()
        if next_poll_time > current_time:
            time.sleep((next_poll_time - current_time).total_seconds())
        next_poll_time = datetime.datetime.now() + wait_polling_period

        response, content = http.request(url + '/uploads/' + upload_token,
                                         method='GET', headers=headers)

        print 'Upload state polled. Response: %r.' % content

        if not oauth_refreshed and response.status == 403:
            print 'Oauth token refreshed. Continue polling.'
            headers = _CreateHeaders(_GenerateOauthToken())
            oauth_refreshed = True
            continue

        if response.status != 200:
            break

        resp_json = json.loads(content)
        if resp_json['state'] == 'COMPLETED' or resp_json['state'] == 'FAILED':
            break

    return response, resp_json


# Because of an issues on the Dashboard side few measurements over a large set
# can fail to upload. That would lead to the whole upload to be marked as
# failed. Check it, so it doesn't increase flakiness of our tests.
# TODO(crbug.com/1145904): Remove check after fixed.
def _CheckFullUploadInfo(url, upload_token,
                         min_measurements_amount=50,
                         max_failed_measurements_percent=0.03):
    """Make a HTTP GET requests to the Performance Dashboard to get full info
    about upload (including measurements). Checks if upload is correct despite
    not having status "COMPLETED".

    Args:
      url: URL of Performance Dashboard instance, e.g.
          "https://chromeperf.appspot.com".
      upload_token: String that identifies Performance Dashboard and can be used
        for the status check.
      min_measurements_amount: minimal amount of measurements that the upload
        should have to start tolerating failures in particular measurements.
      max_failed_measurements_percent: maximal percent of failured measurements
        to tolerate.
    """
    headers = _CreateHeaders(_GenerateOauthToken())
    http = httplib2.Http()

    response, content = http.request(url + '/uploads/' + upload_token +
                                     '?additional_info=measurements',
                                     method='GET', headers=headers)

    if response.status != 200:
        print 'Failed to reach the dashboard to get full upload info.'
        return False

    resp_json = json.loads(content)
    print 'Full upload info: %s.' % json.dumps(resp_json, indent=4)

    if 'measurements' in resp_json:
        measurements_cnt = len(resp_json['measurements'])
        not_completed_state_cnt = len([
            m for m in resp_json['measurements']
            if m['state'] != 'COMPLETED'
        ])

        if (measurements_cnt >= min_measurements_amount and
            (not_completed_state_cnt / (measurements_cnt * 1.0) <=
                max_failed_measurements_percent)):
            print('Not all measurements were confirmed to upload. '
                  'Measurements count: %d, failed to upload or timed out: %d' %
                  (measurements_cnt, not_completed_state_cnt))
            return True

    return False


# TODO(https://crbug.com/1029452): HACKHACK
# Remove once we have doubles in the proto and handle -infinity correctly.
def _ApplyHacks(dicts):
    def _NoInf(value):
        if value == float('inf'):
            return histogram.JS_MAX_VALUE
        if value == float('-inf'):
            return -histogram.JS_MAX_VALUE
        return value

    for d in dicts:
        if 'running' in d:
            d['running'] = [_NoInf(value) for value in d['running']]
        if 'sampleValues' in d:
            d['sampleValues'] = [_NoInf(value) for value in d['sampleValues']]

    return dicts


def _LoadHistogramSetFromProto(options):
    hs = histogram_set.HistogramSet()
    with options.input_results_file as f:
        hs.ImportProto(f.read())

    return hs


def _AddBuildInfo(histograms, options):
    common_diagnostics = {
        reserved_infos.MASTERS: options.perf_dashboard_machine_group,
        reserved_infos.BOTS: options.bot,
        reserved_infos.POINT_ID: options.commit_position,
        reserved_infos.BENCHMARKS: options.test_suite,
        reserved_infos.WEBRTC_REVISIONS: str(options.webrtc_git_hash),
        reserved_infos.BUILD_URLS: options.build_page_url,
    }

    for k, v in common_diagnostics.items():
        histograms.AddSharedDiagnosticToAllHistograms(
            k.name, generic_set.GenericSet([v]))


def _DumpOutput(histograms, output_file):
    with output_file:
        json.dump(_ApplyHacks(histograms.AsDicts()), output_file, indent=4)


def UploadToDashboard(options):
    histograms = _LoadHistogramSetFromProto(options)
    _AddBuildInfo(histograms, options)

    if options.output_json_file:
        _DumpOutput(histograms, options.output_json_file)

    response, content = _SendHistogramSet(options.dashboard_url, histograms)

    if response.status != 200:
        print('Upload failed with %d: %s\n\n%s' % (response.status,
                                                   response.reason, content))
        return 1

    upload_token = json.loads(content).get('token')
    if not options.wait_for_upload or not upload_token:
        print('Received 200 from dashboard. ',
              'Not waiting for the upload status confirmation.')
        return 0

    response, resp_json = _WaitForUploadConfirmation(
        options.dashboard_url,
        upload_token,
        datetime.timedelta(seconds=options.wait_timeout_sec),
        datetime.timedelta(seconds=options.wait_polling_period_sec))

    if ((resp_json and resp_json['state'] == 'COMPLETED') or
        _CheckFullUploadInfo(options.dashboard_url, upload_token)):
        print 'Upload completed.'
        return 0

    if response.status != 200:
        print('Upload status poll failed with %d: %s' % (response.status,
                                                         response.reason))
        return 1

    if resp_json['state'] == 'FAILED':
        print 'Upload failed.'
        return 1

    print('Upload wasn\'t completed in a given time: %d seconds.' %
          options.wait_timeout_sec)
    return 1
